Spell Crystal

When a spell is cast onto this item, the spell will be absorbed into the crystal, which will begin to glow. When the crystal is shattered, the spell will take affect as if the crystal was the caster. Once broken, the crystal loses all magical properties. Different types of crystals must be made for different spell levels, and the level a crystal can be used for is shown by its color. 

The item is a crystal, approximately 6 inches long, 2 inches wide, and cut into an elongated diamond tipped with metal.